my cpu not getting started

untill yesterday my system worked fine.
today when i started the cpu, it started after 2 sec it stops.
i removed the battery(cmos) and tried to start again but no use. same problem repeats.
can any one help me

Do you have another power supply you can try? Or is there a fuse on your PSU that could be tripping?

i dont have another powersupply. the psu doesnot have fuse.

last evening i removed all the connections and all hardware components including powe connections with motherboard. then i reassemble it. it started ok and i am able to shutdown restart after some time but again the problem came today morning. i dont know whats the problem is.

Well, th consensus seems to be, and I agree with it, that you have either a PSU problem or your motherboard is going south.

My recommendation would be to acquire another power supply of slightly more wattage than you are carrying right now and see if that improves matters. If not then you may want to consider replacing the motherboard.